Second best doctor accepting a temporary solution (7)
I believe the answer is:
stopgap
'temporary solution' is the definition.
(I've seen this before)
'second best doctor accepting a' is the wordplay.
'second' becomes 's' (common abbreviation).
'best' becomes 'top' ('top' can be similar in meaning to 'best').
'doctor' becomes 'gp' (general practitioner**).
'accepting' means one lot of letters goes inside another.
'gp' enclosing 'a' is 'gap'.
's'+'top'+'gap'='STOPGAP'
(Other definitions for stopgap that I've seen before include "Temporary expedient" , "Provisional" , "caretaker" , "Temporary measure" , "Makeshift" .)